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Full vulnerability report · 2019
CVE-2019-0211High confidence

Apache HTTP Server Privilege Escalation Vulnerability

Apache · HTTP Server

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 3 Nov 2021

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 65.00% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Apache HTTP Server and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Alpine, Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

7 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.39-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.39-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainapache2Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.4.39-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.38-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.38-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.38-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceapache2Vendor fix publishedDebian records a fixed source-package version for this release.2.4.38-3Debian Security Tracker ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

0 current · 1 archived
CVE-2019-0211 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityhttpd: privilege escalation from modules scriptsNo longer in the provider’s current catalogue
3 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • jbcs-httpd24 as a component of Red Hat JBoss Enterprise Web Server 2
  • jbcs-httpd24-runtime as a component of Red Hat JBoss Enterprise Web Server 2
  • jbcs-httpd24.src as a component of Red Hat JBoss Enterprise Web Server 2
Summary
A flaw was found in Apache where code executing in a less-privileged child process or thread could execute arbitrary code with the privilege of the parent process (usually root). An attacker having access to run arbitrary scripts on the web server (PHP, CGI etc) could use this flaw to run code on the web server with root privileges.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2019-1002

CISA KEV mirrored by ENISA

In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 3 Nov 2021. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
9 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_redhat · RHSA-2019:0980Red Hat Security Advisory: httpd:2.4 security update
  • csaf_redhat · RHSA-2019:1296Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2 security update
  • csaf_opensuse · openSUSE-SU-2019:1209-1Security update for apache2
  • csaf_redhat · RHSA-2019:1297Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2 security update
  • csaf_redhat · RHSA-2019:1543Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2 security update
  • csaf_suse · SUSE-SU-2019:0873-1Security update for apache2
  • csaf_suse · SUSE-SU-2019:0878-1Security update for apache2
  • csaf_redhat · RHSA-2019:0746Red Hat Security Advisory: httpd24-httpd and httpd24-mod_auth_mellon security update
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
01

What, why and how

Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.

What

Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

What

Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2021-11-03.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Use After Free → execute code or commands in the affected security context
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
Remote code executionCWE-416CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2019-1002Known-exploited evidence recorded

In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.

Official EUVD record ↗
BSI · German · WID-SEC-2023-2047Apache HTTP Server: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen im Apache HTTP Server ausnutzen, um seine Rechte zu erweitern, Sicherheitsrestriktionen zu umgehen oder um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-226Multiples vulnérabilités dans Zimbra

De multiples vulnérabilités ont été découvertes dans Zimbra. Elles permettent à un attaquant de provoquer une exécution de code arbitraire, un contournement de la politique de sécurité et une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-420Multiples vulnérabilités dans les produits Juniper

cve.org/CVERecord?id=CVE-2018-19486 Référence CVE CVE-2018-3639 https://www.cve.org/CVERecord?id=CVE-2018-3639 Référence CVE CVE-2018-5360 https://www.cve.org/CVERecord?id=CVE-2018-5360 Référence CVE CVE-2018-5382 https://www.cve.org/CVERecord?id=CVE-2018-5382 Référence CVE CVE-2019-0131 https://www.cve.org/CVERecord?id=CVE-2019-0131 Référence CVE CVE-2019-0165 https://www.cve.org/CVERecord?id=CVE-2019-0165 Référence CVE CVE-2019-0166 https://www.cve.org/CVERecord?id=CVE-2019-0166 Référence CVE CVE-2019-0168 https://www.cve.org/CVERecord?id=CVE-2019-0168 Référence CVE CVE-2019-0169 https://www.cve.org/CVERecord?id=CVE-2019-0169 Référence CVE CVE-2019-0211 https://www.cve.org/CVERecord?id=CVE-2019-0211 Référence CVE CVE-2019-11086 https://www.cve.org/CVERecord?id=CVE-2019-11086 Référence CVE CVE-2019-11087 https://www.cve.org/CVERecord?id=CVE-2019-11087 Référence CVE CVE-2019-11088 https://www.cve.org/CVERecord?id=CVE-2019-11088 Référence CVE CVE-2019-11090 https://www.cve.org/CVERecord?id=CVE-2019-11090 Référence CVE CVE-2019-11097 https://www.cve.org/CVERecord?id=CVE-2019-11097 Référence CVE CVE-2019-11100 https://www.cve.org/CVERecord?id=CVE-2019-11100 Référence CVE CVE-2019-11101 https://www.cve.org/CVERecord?id=CVE-2019-11101 Référence CVE CVE-2019-11102 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-251Multiples vulnérabilités dans les produits IBM

De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, une exécution de code arbitraire à distance et un déni de service à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-141Multiples vulnérabilités dans Apache Httpd

De multiples vulnérabilités ont été découvertes dans Apache Httpd. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-003357Apache HTTP Server における解放済みメモリの使用に関する脆弱性

Apache HTTP Server には、解放済みメモリの使用に関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Apache HTTP Server: 2.4.17 to 2.4.38
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 8 Apr 2019 · Last source change 21 Oct 2025, 23:45 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2019-1002
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2019-0211 to advisory no longer present in the provider's current catalogue.
    Before
    remediation: access.redhat.com/CVE-2019-0211
    After
    advisory no longer present in the provider's current catalogue
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache HTTP Server: 2.4.17 to 2.4.38 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Apache HTTP Server: 2.4.17 to 2.4.38 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
    Red Hat Product Security ↗
  3. ENISA known-exploited stateENISA EUVD now records this CVE in its known-exploited dataset.
    Before
    not listed in ENISA EUVD known-exploited dataset
    After
    listed in ENISA EUVD known-exploited dataset (EUVD-2019-1002)
    ENISA EUVD ↗
  4. ENISA EUVD mappingEUVD-2019-1002 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2019-1002"}
    ENISA EUVD ↗
  5. Vendor guidanceAuthoritative vendor guidance changed: added remediation: seclists.org/16; removed remediation: access.redhat.com/CVE-2019-0211.
    Before
    patch: lists.apache.org/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@<cvs.httpd.apache.org> · patch: oracle.com/cpuapr2020.html · patch: oracle.com/cpujul2019-5072835.html · 5 more references
    After
    patch: lists.apache.org/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@<cvs.httpd.apache.org> · patch: oracle.com/cpuapr2020.html · patch: oracle.com/cpujul2019-5072835.html · 5 more references
    seclists.org ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    Apache HTTP Server: 2.4.17 to 2.4.38 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
    After
    Apache HTTP Server: 2.4.17 to 2.4.38 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CISA KEV ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    2.4.17 to 2.4.38 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Apache HTTP Server: 2.4.17 to 2.4.38 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  8. Vendor guidanceAuthoritative vendor guidance changed: added patch: lists.apache.org/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@<cvs.httpd.apache.org>; added patch: oracle.com/cpuapr2020.html; removed vendor advisory: access.redhat.com/RHBA-2019:0959; removed vendor advisory: access.redhat.com/RHSA-2019:0746; 6 further additions; 13 further removals.
    Before
    vendor advisory: access.redhat.com/RHBA-2019:0959 · vendor advisory: access.redhat.com/RHSA-2019:0746 · vendor advisory: access.redhat.com/RHSA-2019:0980 · 12 more references
    After
    patch: lists.apache.org/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@<cvs.httpd.apache.org> · patch: oracle.com/cpuapr2020.html · patch: oracle.com/cpujul2019-5072835.html · 5 more references
    seclists.org ↗
  9. Affected versionsThe structured affected or fixed version information changed.
    Before
    2.4.17 to 2.4.38 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    2.4.17 to 2.4.38 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  10. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    seclists.org ↗
  11. CVSS scoreCVSS scoring authority changed from CISA ADP to NIST NVD; the displayed base score remained 7.8.
    Before
    7.8 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    After
    7.8 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    NIST NVD ↗
  12. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2019-1002↗CISA KEV record↗Patch or update reference↗Vendor advisory↗Vendor advisory↗Patch or update reference↗CVE authority or vendor reference↗Public exploit reference↗Public exploit reference↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2019-0211 · cve.blacktree.nl